Question
Skivvie NIX is a monthly women's underwear subscription service (product weighs about 0.11 lbs with a value of $17USD /mo).
We are currently only set up for delivery in the US however, we have been receiving a lot of interest from the UK, Canada, Australia, and New Zealand.
Our site uses a recurring payment widget which ONLY allows us to sell at a price in which the tax and shipping are already included in the price. That being said, we could either set a price for each country or have a flat shipping rate across the board.
USPS - $12 flat rate (But no tracking number)
Recognized carrier - $25+ (guaranteed to reach destination w/ tracking number)
Answer
What is your site built in? Do not make business decisions based around a shipping widget!! They are easily replaceable - get a new one.
When shipping internationally you need to think about 3 things - tracking, shipping fees and duties.
A. No one wants COD charges at door. Have to figure out how to build them into cost
B. Never send USPS - its sucks internationally and takes double time they claim, especially to Canada. The lack of tracking on any package does neither you nor the customer any good
C. Flat fee including duties is always better no one will order a $17 dollar item if it cost $25 to ship! Need to look at how you can set minimum order size to make the math work for you and the logic work for buyers